Klein joins a long line of Democratic incumbents who have trailed in some early polling on their races. Much of the polls have been from GOP sources, but the surveys are still notable, especially when Democrats have shown little polling ammo with which to fight back.

Klein doesn't have particularly bad numbers -- 43 percent favorable, compated to 31 percent unfavorable -- but appears to be suffering from a poor environment. Just 21 percent of voters say they will definitely vote to reelect him.

Klein defeated West 55-45 in 2008.

Update 2:17 p.m.: Klein spokeswoman Sarah Rothschild responds: “While Allen West is focused on a poll for the November election, Congressman Ron Klein is working every day to stimulate the economy and on bipartisan solutions that will protect Florida homeowners, crack down on Medicare fraud and impose tougher sanctions on the rogue regime in Iran.”